K 10
svn:author
V 2
mm
K 8
svn:date
V 27
2013-04-30T10:05:47.680584Z
K 7
svn:log
V 324
MFC r249858:
Merge vendor bugfix for a possible deadlock related to async destroy
and improve write performance by introducing a new lock protecting
tx_open_txg.

Illumos ZFS issues:
  3642 dsl_scan_active() should not issue I/O to determine if async
       destroying is active
  3643 txg_delay should not hold the tc_lock

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